Q: What are the prime factors of the number 636,576?

 A: 2, 3, 19, 349

Why are those the prime factors of the number 636,576?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 636,576

636,576
Factor Arrows
2318,288
Factor Arrows
2159,144
Factor Arrows
279,572
Factor Arrows
239,786
Factor Arrows
219,893
Factor Arrows
36,631
Factor Arrows
19349

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 3, 19, 349

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 3 x 19 x 349 = 636,576

This can also be written as 25 x 31 x 191 x 3491 = 636,576

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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